Version 6 Unix
Operating system
Sixth Edition Unix, also called Version 6 Unix or just V6, was the first version of the Unix operating system to see wide release outside Bell Labs. It was released in May 1975 and, like its direct predecessor, targeted the DEC PDP-11 family of... Wikipedia
Default user interface: Command-line interface (Thompson shell)
License: Originally proprietary commercial software, now free software under a BSD License
OS family: Unix
Source model: Open source
Working state: Historic